Examine This Report on a-BBO Crystal
Examine This Report on a-BBO Crystal
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The crystal axis is c. The Main ray is parallel on the path accustomed to evaluate the tuning angle (θ), that's optimized through stage matching. Conversion performance is optimized for rays parallel into the chief ray and even worse for rays at more substantial angles (ψ) to your chief ray.
The team velocities of the fundamental and next harmonic pulses may also be unique, even if period-matched, along with the magnitude in the group velocity mismatch depends upon the crystal properties as well as optical frequencies inside the pulses.
The Electrical power in both equally waves propagates in directions based on their Poynting vectors. Snell's law will not describe the way of Vitality movement, but it really may be used to calculate the path in the k-vector within the crystal.
When a person of those β-BBO Crystals is mounted within the RSP1 mount, the crystal might be centered more than the 8-32 (M4) gap within the mount's base without the need to have for spacers.
We use Numerical Aperture (NA) to explain the extent of the angular content. Preferably, the elemental laser light might be collimated all over the crystal, considering the fact that collimated gentle resembles a bunch of rays aligned to the exact same path having an NA of zero.
The four decrease figures illustrate which the group velocity hold off (temporal wander-off) raises as the pulses propagate via the material. The temporal wander-off is illustrated for distances Z0 as a result of Z3, which might be indicated to the diagram at top rated.
Although the above mentioned course of action offers a great rule of thumb for LIDT values, please contact Tech Assistance In case your wavelength is different from the required LIDT wavelength. In the event your power density is less than the altered LIDT of your optic, then the optic really should function for the software.
It is often essential to concentrate the incident mild within the crystal for SHG programs, because efficient technology of next harmonic gentle calls for significant peak intensities, including 109 W/cm2. When working with femtosecond pulses with moderate energies within the nanojoule selection, getting the required peak intensities can involve modest focal spots.
For the reason that refractive index won't fluctuate linearly with frequency in dispersive crystals like β-BBO, it is not possible to optimally stage match each individual frequency while in the enter pulse's spectral vary With all the corresponding 2nd harmonic frequency inside the generated website pulse.
The temporal stroll-off with the slower pulse with regard into the faster can be a considerable portion of the heart beat period. This can be illustrated in Figure 22.
The group velocity along with the phase velocity will not be equal, meaning the sine wave on the provider along with the envelope of the pulse transfer as a result of optical media at distinct speeds.
When comparing an LIDT specified for any pulsed laser for your laser, it is crucial to find out the following:
The physical, chemical, optical, and thermal Qualities from the α -BBO are just like These of your BBO crystals, nevertheless the α -BBO will not exhibit the nonlinear optical Homes because of the central symmetry of its crystal structure.
Also, the structural and compositional characteristics of BBO give it with extraordinary thermal stability and resistance against environmental challenges.